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9th Class Science Sound Question Bank Sound Summative Objective Problems

  • question_answer
    A person fires a gun in front of a building 167m away. If the speed of sound is 334 m/s. Calculate the time in which he hears an echo.

    A)  0.2 s                     

    B)  2 s  

    C)  1.0 s     

    D)  0.1 s

    Correct Answer: C

    Solution :

      \[d=167\text{ }m,\text{ }v=334\text{ }m/s,\text{ }t=?\] we know, \[t=\frac{2d}{v}\] \[=\frac{2\times 167}{334}=1.0s\]           


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